Crosslinked Reinforcing Cord Coating for Water- and Oil-Resistant Rubber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rubber products with reinforcing cords face strength deterioration under high-temperature and high-bending conditions due to peeling-off between the reinforcing cord and the rubber matrix, as well as internal cracks, especially when exposed to water or oil.
Innovation Solution
A reinforcing cord with bundled fibers and a crosslinkable coating layer that bonds the fibers and strands together through thermal treatment, enhancing resistance to water and oil and improving bending fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional RFL liquid coating is applied to reinforcing fibers, then the coating process is simple and fast, but the fibers are not bonded to each other and gaps form during bending, leading to strength deterioration
Solution Approach 1:
The patent changes the chemical parameters of the coating liquid by incorporating crosslinkable materials (such as silane crosslinking agents or peroxide crosslinking agents) into the conventional RFL liquid system. This modification enables the coating to undergo crosslinking reactions under specific conditions, transforming it from a simple protective layer into a bonding matrix that firmly connects fibers together, thereby preventing gap formation during bending while maintaining manufacturing feasibility
Solution Approach 2:
The patent creates a composite coating system by combining conventional RFL liquid components with crosslinkable materials. This composite coating layer simultaneously provides the protective functions of the original RFL liquid and the bonding functions of the crosslinking agents, achieving both ease of manufacture and improved cord strength through the synergistic effect of multiple materials
2Productivity
If thermal treatment is applied to complete the RFL liquid reaction, then the coating process is efficient, but the primarily twisted fibers remain merely in contact without bonding, allowing water and oil penetration that accelerates strength deterioration
Solution Approach 1:
The patent modifies the thermal treatment parameters by applying higher temperatures (such as 150-200°C) for controlled periods to activate the crosslinking reactions in the coating layer. This enhanced thermal treatment not only completes the conventional RFL liquid reaction but also triggers the crosslinking of the incorporated crosslinkable materials, forming a dense, bonded network structure that prevents water and oil penetration while maintaining high productivity
Solution Approach 2:
The patent replaces the simple thermal drying process with a chemically active thermal treatment process. Instead of merely evaporating solvents, the thermal treatment now serves to activate crosslinking reactions, transforming the coating from a loosely held assembly to a chemically bonded structure that provides reliable resistance to water and oil penetration
3Force
If reinforcing cords are used in rubber products under high-temperature and high-bending conditions, then the products can withstand operational loads, but peeling-off occurs between the cord and rubber matrix, and internal cracks develop, especially when exposed to water or oil
Solution Approach 1:
The patent applies preliminary crosslinking treatment to the reinforcing cord coating before the cord is embedded in the rubber matrix. This preliminary action creates a pre-bonded, stable structure in the cord that resists subsequent peeling forces and internal crack development during high-temperature and high-bending operations, even when exposed to water or oil environments
Solution Approach 2:
The patent creates a composite structure where the crosslinked coating layer acts as an intermediate layer between the reinforcing fibers and the rubber matrix. This composite approach improves the interfacial bonding stability, preventing peeling-off between the cord and rubber matrix under severe operating conditions while maintaining the load bearing capacity of the reinforcing cord
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reinforcing cord with strong resistance to water and oil, minimizing strength deterioration and peeling-off issues, resulting in improved bending fatigue resistance, especially under conditions involving water or oil.
Implementation Method 1
the coating layer contains a material that is crosslinkable by thermal treatment
Implementation Method 2
crosslinkable by thermal treatment
Implementation Method 3
exhibiting resistance against water and oil
Data Source
AI summary
A reinforcing cord for rubber reinforcement of the present invention that is used for reinforcing a rubber product is provided with a plurality of strands. The strand includes bundled fibers and a coating layer formed so as to cover the bundled fibers. The plurality of strands are in tight contact with one another via the coating layer. The coating layer contains a material that is crosslinkable by thermal treatment. A method of manufacturing the reinforcing cord for rubber reinforcement includes the steps of (i) forming strands that include bundled fibers and a coating layer formed so as to cover the bundled fibers, and (ii) bringing the strands into tight contact with one another via the coating layer by twisting the strands together. The coating layer contains a material that is crosslinkable by thermal treatment.